CN109518098A - A kind of austenitic cryogenic steel and preparation method thereof - Google Patents
A kind of austenitic cryogenic steel and preparation method thereof Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a kind of austenitic cryogenic steels and preparation method thereof, its chemical component and mass fraction are as follows: Mn:14~20%, Ni:0.3~1.3%, Cr:2~5%, C:50C+Mn+1.8Ni+1.3Cr >=50% and C≤0.7%, Nb:0.02~0.1%, 0 < Si≤0.6%, 0 < Al≤0.3%, 0 < N≤0.12%, surplus are Fe and inevitable impurity element.Austenite structure volume fraction >=97% of low-temperature steel, average crystal grain diameter≤80 μm, -196 DEG C of Charpy-type test ballistic work >=80J.By the steel billet with chemical component identical as above-mentioned austenitic cryogenic steel by heating, deformation and cooling treatment, the technique combined by high-temperature particles with water-tenacity treatment, Gao Meng, low nickel, micro- niobium austenitic cryogenic steel at low temperature with excellent impact flexibility is prepared, preparation method is simple.
Description
Technical field
The present invention relates to low-temperature steel and preparation method thereof more particularly to a kind of austenitic cryogenic steels and preparation method thereof.
Background technique
The storage of the substances such as liquefied natural gas (- 162 DEG C of boiling point), liquid oxygen (- 183 DEG C of boiling point) and liquid nitrogen (- 196 DEG C of boiling point)
And transport needs the structural material under condition of ultralow temperature with high impact toughness.As common low-temperature steel, 9%Ni steel and
The materials such as Cr-Ni austenitic stainless steel require to add the Ni element of a large amount of valuableness, therefore at high cost.The main of 9%Ni steel is shown
Micro-assembly robot is martensite, and controlled rolling and controlled cooling and repeatedly heat treatment are needed although intensity is higher, in manufacturing process, and manufacture difficulty is big,
Furthermore it is also easy to arc blow phenomenon occur in welding, it is big using difficulty.In contrast, the comprehensive mechanical property of austenite structure
And physical property is more excellent, is more preferably cryogenic material organization type.Although Cr-Ni austenitic stainless steel is also used as low-temperature steel
It uses, but largely adds the elements such as Cr, Ni in its alloying component and mainly consider corrosion resistance and not cryogenic mechanics performance.
In order to obtain, cost is lower, more preferably low temperature Steel material, patent document CN104220617A disclose one kind to performance
There is the austenitic steel of low-temperature flexibility with excellent machining property and in welding heat affected region, include: 15~35%
The < Cu≤5% of Mn, 23.6C+Mn >=28%, 33.5C-Mn≤23%, 0,28.5C+4.4Cr≤57%, surplus is iron and miscellaneous
Prime element.Ni element is not added in the invention completely, and with Mn for Ni, Mn content is up to 35%, and so high Mn content will lead to
Mn volatilization is obvious in steel-making, cutting and welding process, and the implementation of the smelting processes such as limitation vacuum circulation degassing method also will cause
Environmental pollution, therefore manufacture and use difficulty big；In addition the welding advantageous elements such as Ni are entirely free of in steel will significantly improve weldering
The demand of the elements such as Ni in material is connect, therefore increases welding cost；Moreover, the patent, which provides only, realizes certain welding
The technical solution of heat affected area low-temperature flexibility, but the technical solution for realizing steel excellent low temperature toughness itself is not known, it is in fact hot
The zone of influence and the influence factor of the low-temperature flexibility of non-heat affected area are not completely the same, each link process control parameter there may be
Different degrees of difference.Patent document CN101550515B also discloses a kind of copper-containing high-strength high-ductility high manganese steel and its manufacturing method,
Include Mn:15~25%, Cu:0.1~1.5%, C:0.3~1%, Si:0.04~0.8%, Al:0.002~0.8%, surplus
For Fe and inevitable impurity.Prepared potassium steel high intensity and high-elongation, but fail to provide and realize that superior low temperature is tough
Property technical solution, and preparation process include batch, anneal, water quenching etc., preparation process is complicated and enforcement difficulty is big.
Summary of the invention
Goal of the invention: in view of the above problems, it is an object of the present invention to provide a kind of austenitic cryogenic steel, pass through reasonable ingredient
Design obtains Gao Meng, low nickel, micro- niobium austenitic cryogenic steel at low temperature with excellent impact flexibility.
It is a further object of the present invention to provide the preparation methods of the low-temperature steel, pass through organic knot of two kinds of heat treatment process
It closes, can simply and easily obtain the above-mentioned austenitic cryogenic steel with excellent impact toughness.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: a kind of Ovshinsky body hypothermia
Steel, chemical component and mass fraction are as follows: Mn:14~20%, Ni:0.3~1.3%, Cr:2~5%, C:50C+Mn+1.8Ni+
1.3Cr >=50% and C≤0.7%, Nb:0.02~0.1%, 0 < Si≤0.6%, 0 < Al≤0.3%, 0 < N≤0.12%,
Surplus is Fe and inevitable impurity element.
Further, austenite structure volume fraction >=97% of the low-temperature steel, average crystal grain diameter≤80 μm.
Further, -196 DEG C of Charpy-type test ballistic work >=80J of the low-temperature steel.
The effect of chemical component and proportion restriction reason are as follows in the present invention:
In order to guarantee that material still has excellent low-temperature flexibility in the case where reducing Ni content, in addition to adding other Ovshinskies
Outside body stabilizing element, it is also necessary to be fundamentally austenite by material structure type change.Other than Ni, Mn, Cr, C are
Have the effect of reducing martensite transformation temperature in various degree, improve austenite structure stability.Wherein as gap solid solution member
The C of element has strongest stabilization of austenite effect.Every kind of element has its action character, relies on Mn by Ni or merely merely
Such mode is all unfavorable for the reduction of material manufacturing cost and welds the raising of service performance, and should the compound a variety of members of addition
Element simultaneously chooses optimum proportioning.Consider from alloy total amount, when the mass percent of C, Mn, Ni, Cr meet 50C+Mn+1.8Ni+
When 1.3Cr >=50%, austenite has optimal thermodynamic stability, still is able to keep the center of area under -196 DEG C of cryogenic conditions
The stabilization of cubic crystal structure has suitable stacking fault energy without martensitic traoformation, can occur in deformation process
Twinning strengthening simultaneously improves work hardening rate, to have high intensity and plasticity.The face-centered cubic crystal structure of austenite has
The very high ability for resisting crackle and being formed and being extended can improve crack forming energy and extension function during impact deformation, from
And improve low-temperature impact toughness.
Other than meeting certain alloy total amount to obtain with the austenite structure of optimum stabilization, every kind of alloy member
There are also its respective pros and cons effects for element, need to limit content range respectively:
Mn:Mn and Ni is influencing tissue and aspect of performance with similar effect as alloying element, therefore Mn can be used as
The substitute element of Ni is to reduce the additive amount of Ni.Mn has the function of very strong stable austenite, while also can be with solid solution
Schedule of reinforcement improves the intensity of austenite, but Mn too high levels are easy in crystal boundary segregation and weaken crystal boundary, to reduce steel
Low-temperature impact toughness, in addition, Mn too high levels are also easy to generate obvious volatilization during smelting, cutting, welding etc., to increase
The difficulty for manufacturing and using greatly, should control 14~20%.
Ni: can significantly improve stabilization of austenite, and be not easily formed objectionable carbides or in the form of segregation it is weak
Change crystal boundary, additionally it is possible to improve welding joint mechanical property to reduce materials'use difficulty, be to improve low-temperature steel comprehensive performance
Important alloying element, but it is expensive, and a large amount of additions are unfavorable for reducing cost, should control 0.3~1.3%.
Cr: can reduce martensite transformation temperature, while the intensity of austenite can be also improved in a manner of solution strengthening, but
It is that Cr too high levels are easy to form Carbide Precipitation in grain boundaries and reduce grain-boundary strength, so that the low-temperature impact for reducing steel is tough
Property, it should control 2~5%.
C: have the function of extremely strong reduction martensite transformation temperature, improve stabilization of austenite, and have extremely strong
When solution strengthening effect, C and other elements content meet 50C+Mn+1.8Ni+1.3Cr >=50%, austenite has optimal heat
Mechanical stability still is able to that its crystal structure is kept to stablize without martensitic traoformation under -196 DEG C of cryogenic conditions.Make
There is strongest stabilization of austenite effect for the C of gap solid solution element, the slight change of C content will significantly affect entire alloy
The tissue and performance of system, need to accurately define the content range of C according to Ni, Mn, Cr equal size of actual interpolation.C content
It should control within 0.7%, it is a large amount of in order to avoid being formed in conjunction with the elements such as the too strong gap C solution strengthening and C and Cr, Mn
Coarse carbide seriously damage the low-temperature impact toughness of steel.
Nb: AUSTENITE GRAIN COARSENING when hindering heating in the form of pinning crystal boundary is precipitated in higher melting-point disperse niobium carbide,
The growth rate that recrystallization austenite grain is reduced during high temperature deformation, help to obtain the recrystal grain of refinement, from
And changes austenite grain boundary state and improve low-temperature impact toughness.In addition, austenite crystal intragranular is tiny and the Nb of disperse is precipitated also
It can be improved intensity.But Nb too high levels are unfavorable for the mechanical property that high temperature deformation recrystallizes and can damage steel, and will increase
Cost of alloy should be controlled 0.02~0.1%.
Si: solution strengthening can be generated, but Si can weaken crystal boundary in crystal boundary segregation and cause along brilliant brittleness, furthermore Si can also
Plasticity is reduced, should be controlled within 0.6%.
Al: has the function of certain reinforcing austenite grain boundary, moreover it is possible to be effectively improved property of welded joint, but be excessively added
Large-sized Al easy to form3O2, the precipitated phases such as AlN and damage low-temperature impact toughness, should control within 0.3%.
N: having stronger stabilization of austenite effect, and suitable N can be improved intensity and unobvious damage austenite group
The low-temperature flexibility knitted, but coarse high-melting-point nitride easy to form is excessively added and damages mechanical property, it should control
Within 0.12%.
Inevitable S, P impurity element in steelmaking process, S easily form MnS with Mn, and P is easy in crystal boundary segregation and reduces crystalline substance
Boundary's resistance to crack extension ability needs to control S, P in bottom line for the low-temperature flexibility for improving steel.
The method of the present invention for preparing above-mentioned austenitic cryogenic steel, comprising the following steps:
(1) it heats: by the heating steel billet with chemical component identical as above-mentioned austenitic cryogenic steel to 1050~1180 DEG C
And sufficiently austenitizing is completed in heat preservation；
(2) deformation: rolling the steel billet after heating, and 960~1020 DEG C of rolling temperature, passage deformation quantity >=15%,
Total deformation quantity >=75%, realizes thermomechanical treatment effect；
(3) cooling: water cooling realizes high-temperature particles and water-tenacity treatment effect to room temperature to the steel after high temperature deformation immediately
Combination, obtain austenitic cryogenic steel.
Further, the soaking time in the step (1) is 0.8~1.4min/mmx steel billet thickness.
Further, in the step (3) within the scope of 400~850 DEG C 10~60 DEG C/s of cooling rate.
Blank heating is to 1050~1180 DEG C and keeps the temperature the high temperature austenitic body tissue that can obtain certain crystallite dimension, simultaneously
The austenites Homogenization Process such as carbide dissolution, elements diffusion occur.If heating temperature is too low, carbide dissolution and elements diffusion
Rate reduces, and is unfavorable for austenite homogenization and mechanical property improves；When heating temperature is higher than 1180 DEG C, the carbide of Nb
A large amount of back dissolvings occur, to lose the effect for inhibiting crystal grain to grow up, lead to AUSTENITE GRAIN COARSENING, are unfavorable for improving low temperature punching
Toughness is hit, therefore billet heating temperature should be controlled at 1050~1180 DEG C.In alloy component range of the present invention, material it is thermally conductive
Coefficient is significantly lower than common low-alloy steel, about 20W/ (m DEG C), it is therefore desirable to which enough soaking times are to complete austenite
Change, but soaking time is too long will lead to coarse grains.The selection of soaking time is also contemplated that steel billet thickness, the heat preservation in the present invention
Time is 0.8~1.4min/mmx steel billet thickness.
Rolling deformation is carried out to the austenite structure after heating, austenite recrystallizes, and has refined austenite grain.For
Guarantee recrystallization ratio, the present invention claims rolling temperatures not less than 960 DEG C and passage deformation quantity is not less than 15%, best to ensure
Recrystallization thermodynamic and kinetic conditions, total deformation quantity can guarantee sufficient grain refining effect not less than 75%, carefully
Crystal grain average grain diameter after change can after reach 80 μm or less.During rolling deformation, strain accumulation promotes austenite grain
The precipitation of interior Nb.In Nb content range of the invention, finishing temperature control is lured in 960~1020 DEG C of strains most beneficial for Nb
Precipitation is led, tiny and disperse precipitated phase is obtained, to be conducive to improve the strength of materials in turn.In addition, when finishing temperature is excessively high in
At 1020 DEG C, the Austenite Grain Growth rate after recrystallization is high, is unfavorable for controlling crystallite dimension.
The present invention carries out water cooling immediately after high temperature deformation, and the crystal grain after being able to suppress recrystallization is grown up, and realizes high temperature
The effect of thermomechanical treatment, the austenite grain refined.Importantly, water-cooling process and elevated heating processes are constituted
To the water-tenacity treatment of austenite structure, effectively inhibit a large amount of precipitations of objectionable carbides on crystal boundary to significantly improve low temperature
Impact flexibility.Back dissolving occurs for the objectionable carbides of the elements such as Cr, Mn under high temperature, when accelerating cooling because not having enough power
Condition and be difficult to largely be precipitated.Within the scope of 400~850 DEG C, especially near 700 DEG C, if cooling rate is not high enough,
The carbide of Cr, Mn will be precipitated in grain boundaries.Crystal boundary will be greatly lowered when reaching 3% or more in the volume fraction of Carbide Precipitation
Binding force, to seriously damage low-temperature impact toughness.Cooling rate within the scope of 400~850 DEG C is required to be not less than 10 in the present invention
DEG C/s, sufficiently to weaken the dynamic conditions of Carbide Precipitation and control Carbide Precipitation amount in floor level.But when cooling
Rate is excessively high, and when being such as higher than 60 DEG C/s, the thermal stress of steel plate is big after cooling, to increase the use difficulty of steel plate, is unfavorable for
Overall effect of the invention.
High-temperature particles, water-tenacity treatment both heat treatment process are combined in the present invention, are formed a kind of high
Warm deformation water-tenacity treatment technique can obtain required tissue and performance by the technique of a thermal cycle.Through the invention
Technique obtains the austenite structure of 97% or more volume fraction, remaining is minimal amount of carbide that may be present, nitride
Deng the second phase.
The utility model has the advantages that the present invention is by rationally designing the alloying elements such as C, Ni, Mn, Nb and using high-temperature particles
The technique combined with water-tenacity treatment is prepared for still being able to keep stable structure, objectionable carbides precipitation effective at -196 DEG C
The Gao Meng of inhibition, low nickel, micro- niobium austenite structure low-temperature steel have excellent low-temperature impact toughness；The use of Ni is reduced, significantly
Reduce the cost of low-temperature steel.
Detailed description of the invention
Fig. 1 is the figure of C mass fraction (wt%) range of the invention；
Fig. 2 is optical microstructure's figure of the low-temperature steel in the embodiment of the present invention 1.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 show the areal map of C content of the present invention.
Embodiment 1
A kind of austenitic cryogenic steel, chemical component and mass fraction are as follows: 17.2%Mn, 1%Ni, 3.9%Cr, 0.57%
C, 0.05%Nb, 0.21%Si, 0.1%Al, 0.05%N, surplus are S, P impurity element below of Fe and 0.05%, 50C+Mn+
1.8Ni+1.3Cr=52.57%.
To 1120 DEG C and 180min is kept the temperature with a thickness of the heating steel billet of 150mm；It is rolled after heating, finishing temperature 980
DEG C, passage deformation quantity 20%, total deformation quantity 85%, steel plate thickness 22.5mm；Water cooling is to room temperature immediately after rolling, and 400~850 DEG C
23 DEG C/s of cooling rate in range.
Fig. 2 show optical microstructure's figure of low-temperature steel, organizes as austenite.Austenite volume fraction 99.4% is put down
Equal 63 μm of crystal grain diameter, almost without carbide, -196 DEG C of Charpy-type test ballistic work 164J.
Embodiment 2
19.8%Mn, 1.3%Ni, 4.9%Cr, 0.43%C, 0.1%Nb, 0.1%Si, 0.02%Al, 0.12%N, with
And S, P impurity element below of surplus Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=50.01%
The heating steel billet of thickness 220mm is to 1050 DEG C and keeps the temperature 300min；It is rolled after heating, 960 DEG C of finishing temperature,
Passage deformation quantity 15%, total deformation quantity 75%, steel plate thickness 55mm；After rolling immediately water cooling to room temperature, 400~850 DEG C of ranges
Interior 60 DEG C/s of cooling rate.
Austenite volume fraction 99.6%, 75 μm of average crystal grain diameter；Almost without carbide, -196 DEG C of Charpy impact examinations
Test ballistic work 203J.
For Mn, Ni, Cr content close to range limit, C content is relatively low in the present embodiment, but total alloy amount 50C+Mn+
1.8Ni+1.3Cr=50% can equally obtain stable austenite structure.And by process, inhibit Carbide Precipitation,
With compared with HI high impact function.
Embodiment 3
20%Mn, 1.25%Ni, 5%Cr, 0.7%C, 0.02%Nb, 0.6%Si, 0.3%Al, 0.015%N, Yi Jiyu
Measure S, P impurity element below of Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=63.75%.
The heating steel billet of thickness 80mm is to 1180 DEG C and keeps the temperature 65min；It is rolled after heating, 1020 DEG C of finishing temperature,
Passage deformation quantity 22%, total deformation quantity 90%, steel plate thickness 8mm；Water cooling is to room temperature immediately after rolling, within the scope of 400~850 DEG C
10 DEG C/s of cooling rate.
Austenite volume fraction 98.5%, 71 μm of average crystal grain diameter；Grain boundaries have minute quantity carbide, -196 DEG C of Charpy
Impact test ballistic work 94J.
Mn, Ni, Cr content are close to range limit in the present embodiment, and C content is also close to range limit.Although high level
C and Cr increases carbide in tissue, but total alloy amount 50C+Mn+1.8Ni+1.3Cr=63.8%, carbide still control
Within certain volume score (< 3%), therefore ballistic work can also reach the object of the invention.
Embodiment 4
14.1%Mn, 0.3%Ni, 2%Cr, 0.67%C, 0.07%Nb, 0.05%Si, 0.14%Al, 0.07%N, with
And S, P impurity element below of surplus Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=50.74%.
The heating steel billet of thickness 150mm is to 1090 DEG C and keeps the temperature 165min；It is rolled after heating, 987 DEG C of finishing temperature,
Passage deformation quantity 18%, total deformation quantity 88%, steel plate thickness 18mm；After rolling immediately water cooling to room temperature, 400~850 DEG C of ranges
Interior 25 DEG C/s of cooling rate.
Austenite volume fraction 99.2%, 77 μm of average crystal grain diameter；Almost without carbide, -196 DEG C of Charpy impact examinations
Test ballistic work 110J.
Mn, Ni, Cr content are close to range lower limit in the present embodiment, and C content demand is higher at this time, can just obtain stable Austria
Family name's body tissue, and process through the invention obtains HI high impact function.
Comparative example 1
14.5%Mn, 0.3%Ni, 2.6%Cr, 0.39%C, 0.05%Nb, 0.1%Si, 0.09%Al, 0.06%N, with
And S, P impurity element below of surplus Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=37.92%.
The heating steel billet of thickness 180mm is to 1100 DEG C and keeps the temperature 180min；It is rolled after heating, 998 DEG C of finishing temperature,
Passage deformation quantity 20%, total deformation quantity 85%, steel plate thickness 27mm；After rolling immediately water cooling to room temperature, 400~850 DEG C of ranges
Interior 25 DEG C/s of cooling rate.
Austenite volume fraction 92%, 70 μm of average crystal grain diameter；Contain martensite in tissue, almost without carbide ,-
196 DEG C of Charpy-type test ballistic work 0J.
Since Mn, Ni, Cr, C total alloy amount are too low, fail the requirement for reaching 50C+Mn+1.8Ni+1.3Cr >=50%, because
This stabilization of austenite is low, and martensite transformation temperature is high.Even if still cannot be obtained steady enough using technique provided by the invention
, there is martensitic structure in fixed austenite structure.At -196 DEG C, there will be more austenites to be changed into high-intensitive geneva
Body, seriously damages impact flexibility, and ballistic work falls to zero.
Comparative example 2
16.5%Mn, 1.1%Ni, 8.1%Cr, 0.84%C, 0.07%Nb, 0.15%Si, 0.12%Al, 0.2%N, with
And S, P impurity element below of surplus Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=71.01%.
The heating steel billet of thickness 150mm is to 1150 DEG C and keeps the temperature 180min；It is rolled after heating, 975 DEG C of finishing temperature,
Passage deformation quantity 20%, total deformation quantity 81%, steel plate thickness 28.5mm；After rolling immediately water cooling to room temperature, 400~850 DEG C of models
Enclose interior 15 DEG C/s of cooling rate.
Austenite volume fraction 95%, 67 μm of average crystal grain diameter；Carbide volume fraction is greater than 4%, -196 DEG C of Charpy
Impact test ballistic work 5J.
Cr, C, N content are obviously beyond the scope of this invention, and a large amount of carbide is caused to be formed in grain boundaries, and the gap of C, N
Solid solution strengthening effect is excessively high, these all can seriously damage low-temperature impact toughness.
Comparative example 3
17.2%Mn, 1%Ni, 3.9%Cr, 0.57%C, 0.05%Nb, 0.21%Si, 0.1%Al, 0.05%N, and
S, P impurity element below of surplus Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=52.57%.
The heating steel billet of thickness 100mm is to 1280 DEG C and keeps the temperature 120min；It is rolled after heating, finishing temperature 1004
DEG C, passage deformation quantity 15%, total deformation quantity 55%, steel plate thickness 45mm；After rolling immediately water cooling to room temperature, 400~850 DEG C of models
Enclose interior 22 DEG C/s of cooling rate.
Austenite volume fraction 99.4%, 109 μm of average crystal grain diameter；Almost without carbide, -196 DEG C of Charpy impacts
Test ballistic work 67J.
Although each component content is all within the scope of the present invention, since billet heating temperature is excessively high, total deformation quantity is too low, no
Sufficient austenite thinning effect can be reached, austenite grain size is larger, even if carbide is few, is also unfavorable for low-temperature impact
Toughness improves.
Comparative example 4
17.2%Mn, 1%Ni, 3.9%Cr, 0.57%C, 0.05%Nb, 0.21%Si, 0.1%Al, 0.05%N, and
S, P impurity element below of surplus Fe and 0.05%；50C+Mn+1.8Ni+1.3Cr=52.57%.
The heating steel billet of thickness 100mm is to 1080 DEG C and keeps the temperature 120min；It is rolled after heating, 968 DEG C of finishing temperature,
Passage deformation quantity 19%, total deformation quantity 80%, steel plate thickness 20mm；Without water cooling after rolling, cooled to room temperature, 400
2.1 DEG C/s of cooling rate within the scope of~850 DEG C.
Austenite volume fraction 93%, 72 μm of average crystal grain diameter；Carbide volume fraction is greater than 6%, -196 DEG C of Charpy
Impact test ballistic work 0J.
Although each component content, billet heating temperature and deforming technique are all within the scope of the present invention, do not have after rolling
Take water-cooled process, but cooled to room temperature, fail to reach water-tenacity treatment technological effect, occurs excessive carbon in tissue
Compound seriously compromises low-temperature impact toughness.
Above-described embodiment does not limit the scope of the invention only for being illustrated more clearly that the present invention.Except above-described embodiment
Outside, there are also other embodiments, all technical solutions formed using equivalent substitution or equivalent transformation to all fall within the present invention by the present invention
Within protection scope.
Claims (6)
1. a kind of austenitic cryogenic steel, which is characterized in that its chemical component and mass fraction are as follows: Mn:14~20%, Ni:0.3~
1.3%, Cr:2~5%, C:50C+Mn+1.8Ni+1.3Cr >=50% and C≤0.7%, Nb:0.02~0.1%, 0 < Si≤
0.6%, 0 < Al≤0.3%, 0 < N≤0.12%, surplus are Fe and inevitable impurity element.
2. austenitic cryogenic steel according to claim 1, which is characterized in that the austenite structure volume of the low-temperature steel point
Number >=97%, average crystal grain diameter≤80 μm.
3. austenitic cryogenic steel according to claim 1, which is characterized in that Charpy impact of the low-temperature steel at -196 DEG C
Test ballistic work >=80J.
4. a kind of method for preparing austenitic cryogenic steel described in claim 1, which comprises the following steps:
(1) it heats: the heating steel billet with chemical component identical as above-mentioned austenitic cryogenic steel to 1050~1180 DEG C and is filled
Code insurance temperature completes austenitizing；
(2) deformation: rolling the steel billet after heating, and 960~1020 DEG C of rolling temperature, passage deformation quantity >=15%, total shape
Variable >=75%；
(3) cooling: water cooling obtains austenitic cryogenic steel to room temperature to the steel after high temperature deformation immediately.
5. the preparation method of austenitic cryogenic steel according to claim 4, which is characterized in that the guarantor in the step (1)
The warm time is 0.8~1.4min/mmx steel billet thickness.
6. the preparation method of austenitic cryogenic steel according to claim 4, which is characterized in that 400 in the step (3)
10~60 DEG C/s of cooling rate within the scope of~850 DEG C.
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| CN201811268250.8A CN109518098A (en) | 2018-10-29 | 2018-10-29 | A kind of austenitic cryogenic steel and preparation method thereof |
| GB2105873.0A GB2592527B (en) | 2018-10-29 | 2018-12-05 | Austenite low-temperature steel and preparation method thereof |
| PCT/CN2018/119271 WO2020087653A1 (en) | 2018-10-29 | 2018-12-05 | Austenite low temperature steel and preparation method therefor |
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Cited By (6)
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| CN111840659A (en) * | 2020-04-30 | 2020-10-30 | 中科益安医疗科技（北京）股份有限公司 | High-safety blood vessel support without nickel metal medicine elution and its making method |
| CN112941409A (en) * | 2021-01-27 | 2021-06-11 | 南京钢铁股份有限公司 | Low-temperature steel and manufacturing method thereof |
| CN113957353A (en) * | 2021-10-26 | 2022-01-21 | 东北大学 | High-manganese high-toughness steel applicable at 4.2K temperature and preparation method thereof |
| CN115074615A (en) * | 2021-03-16 | 2022-09-20 | 宝山钢铁股份有限公司 | Environment-friendly ultralow-temperature high manganese steel and steel plate and manufacturing method thereof |
| CN115261743A (en) * | 2022-06-22 | 2022-11-01 | 河钢股份有限公司 | Low-cost high-manganese steel plate and production method thereof |
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| GB1359823A (en) * | 1970-06-15 | 1974-07-10 | Crisplant As | Conveyor systems |
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| JPS58144418A (en) * | 1982-02-22 | 1983-08-27 | Nippon Steel Corp | Manufacturing method of high Mn steel |
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- 2018-10-29 CN CN201811268250.8A patent/CN109518098A/en active Pending
- 2018-12-05 GB GB2105873.0A patent/GB2592527B/en active Active
- 2018-12-05 WO PCT/CN2018/119271 patent/WO2020087653A1/en active Application Filing
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| JPS56263A (en) * | 1979-06-12 | 1981-01-06 | Sumitomo Metal Ind Ltd | High-manganese-content steel for low temperature |
| CN101649412A (en) * | 2008-08-15 | 2010-02-17 | 宝山钢铁股份有限公司 | Hadifield steel with excellent mechanical property and manufacturing method thereof |
| CN106222554A (en) * | 2016-08-23 | 2016-12-14 | 南京钢铁股份有限公司 | A kind of economical steel used at ultra-low temperature and preparation method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111840659A (en) * | 2020-04-30 | 2020-10-30 | 中科益安医疗科技（北京）股份有限公司 | High-safety blood vessel support without nickel metal medicine elution and its making method |
| CN112941409A (en) * | 2021-01-27 | 2021-06-11 | 南京钢铁股份有限公司 | Low-temperature steel and manufacturing method thereof |
| CN115074615A (en) * | 2021-03-16 | 2022-09-20 | 宝山钢铁股份有限公司 | Environment-friendly ultralow-temperature high manganese steel and steel plate and manufacturing method thereof |
| CN115074615B (en) * | 2021-03-16 | 2023-10-17 | 宝山钢铁股份有限公司 | Environment-friendly ultralow-temperature high-manganese steel, steel plate and manufacturing method thereof |
| CN113957353A (en) * | 2021-10-26 | 2022-01-21 | 东北大学 | High-manganese high-toughness steel applicable at 4.2K temperature and preparation method thereof |
| CN115261743A (en) * | 2022-06-22 | 2022-11-01 | 河钢股份有限公司 | Low-cost high-manganese steel plate and production method thereof |
| CN117344230A (en) * | 2023-10-08 | 2024-01-05 | 燕山大学 | High manganese steel for split frog core rail and wing rail mosaic blocks and application thereof |
| CN117344230B (en) * | 2023-10-08 | 2024-05-17 | 燕山大学 | High manganese steel for split frog heart rail and wing rail inlay block and its application |
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| GB202105873D0 (en) | 2021-06-09 |
| WO2020087653A1 (en) | 2020-05-07 |
| GB2592527B (en) | 2022-08-03 |
| GB2592527A (en) | 2021-09-01 |
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Application publication date: 20190326 |